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Error Identifier: assign.propertyType

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

class Foo
{
    public int $count;

    public function setCount(string $value): void
    {
        $this->count = $value;
    }
}

Why is it reported? #

The value being assigned to a property does not match the property’s declared type. In the example above, the property $count is declared as int, but a string value is being assigned to it. This would cause a TypeError at runtime when strict types are enabled, or an unexpected implicit type coercion otherwise.

How to fix it #

Ensure the assigned value matches the property’s type:

 <?php declare(strict_types = 1);
 
 class Foo
 {
     public int $count;

-    public function setCount(string $value): void
+    public function setCount(int $value): void
     {
         $this->count = $value;
     }
 }

Or convert the value to the correct type before assignment:

 <?php declare(strict_types = 1);
 
 class Foo
 {
     public int $count;

     public function setCount(string $value): void
     {
-        $this->count = $value;
+        $this->count = (int) $value;
     }
 }

How to ignore this error #

You can use the identifier assign.propertyType to ignore this error using a comment:

// @phpstan-ignore assign.propertyType
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: assign.propertyType

Rules that report this error #

• PHPStan\Rules\Properties\TypesAssignedToPropertiesRule [1]

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